Difference between revisions of "OpenShift"

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(OpenShift Client)
(Minishift)
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* Start up a single node OpenShift "cluster":
 
* Start up a single node OpenShift "cluster":
 
  $ minishift start --vm-driver virtualbox
 
  $ minishift start --vm-driver virtualbox
 +
$ kubectl config set-context minishift
  
 
* Install and configure <code>oc</code>:
 
* Install and configure <code>oc</code>:

Revision as of 20:17, 13 June 2018

OpenShift is a computer software product from Red Hat for container-based software deployment and management. It is a supported distribution of Kubernetes using Docker containers and DevOps tools for accelerated application development.

In the world of Infrastructure as a Service (IaaS), Platform as a Service (PaaS), and Software as a Service (SaaS), OpenShift is Red Hat's PaaS.

Different flavours of OpenShift:

OpenShift Origin 
Open source application container platform
OpenShift Online 
Public Application Development hosting service
OpenShift Dedicated 
Managed private cluster on AWS/Google Clouds
OpenShift Enterprise 
On-premise private PaaS

This article will mainly discuss OpenShift Origin.

OpenShift Origin is based on top of Docker containers and the Kubernetes cluster manager, with added developer and operational-centric tools that enable rapid application development, deployment, and lifecycle management.

  • OpenShift Tools:
    • Source Code Management (SCM) -> git
    • Pipelines (CI/CD)
    • Container Registry (OCR), for Docker images
    • Software Defined Networking (SDN)
    • API
    • etcd (stores the state of the various OpenShift components)
    • Governance (managing teams and users to provide access to applications and services)
  • Three ways to interact with OpenShift:
    • Web console (default port: 8443)
    • CLI (OpenShift Client, oc)
    • REST API

Minishift

Minishift is a tool that helps you run OpenShift locally by launching a single-node OpenShift cluster inside a virtual machine. With Minishift you can try out OpenShift or develop with it, day-to-day, on your local machine.

  • Start up a single node OpenShift "cluster":
$ minishift start --vm-driver virtualbox
$ kubectl config set-context minishift
  • Install and configure oc:
$ minishift oc-env
$ export PATH="/home/champ/.minishift/cache/oc/v3.9.0/linux:$PATH"
$ eval $(minishift oc-env)
  • Add ability to login as Admin:
$ minishift addon apply admin-user
$ oc login -u admin  # password = admin
  • Get token for API (valid for 24 hours):
$ TOKEN=$(oc whoami -t)  # E.g., ZndWHOAc7SfJspq3-CwBsb1Wxn7R3zqt9gI2RsABt6M
  • Get a list of OpenShift users:
$ curl -kH "Authorization: Bearer ${TOKEN}" https://192.168.99.101:8443/oapi/v1/users
{
  "kind": "UserList",
  "apiVersion": "v1",
  "metadata": {
    "selfLink": "/oapi/v1/users",
    "resourceVersion": "9069"
  },
  "items": [
    {
      "metadata": {
        "name": "admin",
        "selfLink": "/oapi/v1/users/admin",
        "uid": "270ab9d2-6f44-11e8-bb58-527977685b9f",
        "resourceVersion": "8551",
        "creationTimestamp": "2018-06-13T19:58:33Z"
      },
      "fullName": "admin",
      "identities": [
        "anypassword:admin"
      ],
      "groups": null
    },
    {
      "metadata": {
        "name": "developer",
        "selfLink": "/oapi/v1/users/developer",
        "uid": "f3ed520b-6f37-11e8-bb58-527977685b9f",
        "resourceVersion": "1083",
        "creationTimestamp": "2018-06-13T18:31:14Z"
      },
      "identities": [
        "anypassword:developer"
      ],
      "groups": null
    }
  ]
}

OpenShift Client

  • REST API:
$ oc login -u developer -p developer
Login successful.

You have one project on this server: "myproject"

Using project "myproject".
$ TOKEN=$(oc whoami -t)
$ curl -kH "Authorization: Bearer ${TOKEN}" https://192.168.99.101:8443/oapi/v1/projects
{
  "kind": "ProjectList",
  "apiVersion": "v1",
  "metadata": {
    "selfLink": "/oapi/v1/projects"
  },
  "items": [
    {
      "metadata": {
        "name": "myproject",
        "selfLink": "/oapi/v1/projects/myproject",
        "uid": "f3f818ed-6f37-11e8-bb58-527977685b9f",
        "resourceVersion": "1090",
        "creationTimestamp": "2018-06-13T18:31:14Z",
        "annotations": {
          "openshift.io/description": "Initial developer project",
          "openshift.io/display-name": "My Project",
          "openshift.io/requester": "developer",
          "openshift.io/sa.scc.mcs": "s0:c8,c7",
          "openshift.io/sa.scc.supplemental-groups": "1000070000/10000",
          "openshift.io/sa.scc.uid-range": "1000070000/10000"
        }
      },
      "spec": {
        "finalizers": [
          "openshift.io/origin",
          "kubernetes"
        ]
      },
      "status": {
        "phase": "Active"
      }
    }
  ]
}

External links